Studies have considered a MED of tens of years (e.g., [1]} for a recent paper on the DD scenario) to tens of thousands of years (e.g., [2]} for a recent paper on the CD scenario).
For the VLTP to have any role on the light curve of the SN, the LTP/VLTP cannot occur a long time before the explosion. The typical time of the LTP/VLTP after the AGB phase sets an upper limit on the MED of \(\approx 10^5 {~\rm yr}\) .
Overall, for a pre-explosion LTP/VLTP to occur and play a role I require the MED time to be
\(t_{\rm med} 10^5 {~\rm yr}; \qquad {\rm Condition~2}.\) 
